<track id="pzjkf"></track>

      <track id="pzjkf"></track>
      <tbody id="pzjkf"></tbody>

      Algae, beautiful yet dangerous

      Writer: Matteo Convertino  |  Editor: Zhang Chanwen  |  From: Shenzhen Daily  |  Updated: 2023-11-02

      The Shenzhen Bay in Nanshan District is highly eutrophic and recently, a thick patchy algae bloom was discovered in Talent Park. This bloom covered most water bodies, and investigations are under way to trace its causes and find solutions. The bloom was likely caused by a combination of extreme drought conditions, hyper-salinity due to poor tidal exchange, and high nutrient inflow from a humanmade freshwater canal.


      A thick patchy algae bloom was discovered in Talent Park recently. Matteo Convertino


      Tracking microalgae is crucial to detect whether water bodies have exceeded risk thresholds, whether the algae is blooming, or worse, if the water contains toxic pathogens associated with the emergence of blooms. After analyzing the algae in Talent Park, which consisted mostly of chlorellas, diatoms, and leptolyngbya (a cyanobacteria species), no apparent signs of toxicity were found. However, there were observations of dead birds and fish and high nitrogen and phosphorus levels. Therefore, it is highly recommended not to touch the water due to the potential for skin irritation and toxicity.


      Algae blooms can be seen near Talent Park's bridge where there is lighting at night. Photo by Bowen 


      Multispectral drones can be used to trace blooms and define red areas that are active and potentially more risky. Red pixels identify locations where oxygen levels are potentially very low, which harms biodiversity. These active blooms coincide with areas close to night illumination such as those close to Talent Park's bridge. The light may have contributed to the growth of photosynthetic algaes.


      Algal blooms of dinoflagellates were observed recently in the Dapeng peninsula. Courtesy of Shenzhen Marine Environmental Monitoring Center.


      Recently, other colorful but harmful algal blooms of dinoflagellates were observed in the Dapeng peninsula: red algae during the day and neon-blue bioluminescent at night. Although these blooms have bright colors and artsy patterns, they can be potentially harmful.


      Eutrophication, which results from excessive nutrients, can be caused by dramatic shifts in nutrients, fresh and salt-water flows, sediment, biodiversity, and temperatures. The growth of algae is often a complex combination of slow and fast changes acting together that lead to eutrophication. When this becomes frequent and persistent, it can alter ecosystems, result in carbon emissions, species death, poor water quality, and emerging pathogenic toxins that can severely harm local species as well as people.


      Park staff members remove algaes from the seawater in Talent Park in Nanshan District recently. Matteo Convertino


      Balanced freshwater-saltwater flows, habitat connections, water treatment, protection and restoration of coastal vegetation, fish and other wildlife, ecosystem monitoring, and responsible recreation are necessary solutions to maintain a well-functioning biodiversity in which species support each other. Prevention is crucial, and everyone should join efforts to build better aquatic ecosystems.


      <track id="pzjkf"></track>

        <track id="pzjkf"></track>
        <tbody id="pzjkf"></tbody>